HDN1028: This cushion has all of the same benefits of the Supreme but in a Low Contour base that reduces floor to seat height and is appropriate for manual wheelchairs. Features: -Low contour supreme. -Flexible moisture proof bladder. -Poly-Lite for pressure relief. -Radio frequency sealed to prevent leakage. -Leg abduction post prevents hip rotation and abrasion. -High density molded urethane foam for positioning, support and comfort. -Air vents on each side to evacuate contained air in the molded foam base. -Available in several sizes. Specifications: -3 H x 16 W x 16 D. -3 H x 16 W x 18 D. -3 H x 16 W x 20 D. -3 H x 18 W x 16 D. -3 H x 18 W x 18 D. -3 H x 18 W x 20 D. -3 H x 20 W x 16 D. -3 H x 20 W x 18 D. -3 H x 20 W x 20 D. -3 H x 22 W x 18 D. -3 H x 24 W x 18 D.